#google interview

Chat Noir answers questions from the Internet. Or are they just his questions?

1. Overall Structure of Google Interviews

Google’s onsite or virtual onsite interviews usually consist of technical rounds and a Behavioral (BQ) round. The typical setup includes two to three coding interviews plus one BQ round, with each session lasting about 45 minutes.

2. Key Highlights

During the coding interviews, candidates use Google’s in-house text editor to write code. This editor does not support auto-completion or code execution, so you’ll need to perform a manual dry run of your code to verify its correctness. Interviewers typically ask candidates to solve one main algorithm problem, sometimes followed by several follow-up questions. In rare cases, there may be two medium-difficulty problems instead. Beyond correctness, Google places strong emphasis on your thought process, communication clarity, and ability to handle edge cases. Code readability, variable naming, and modular design are also plus points. Because the editor cannot run code, your verbal reasoning and step-by-step explanation become the key for interviewers to assess your understanding and debugging skills.

3. Common Follow-Up Directions

Follow-up questions in Google interviews often explore deeper or extended problem variations:

Adding new constraints: For example, improving an O(n²) solution to O(n log n).

Scaling to large inputs: Requiring you to consider space complexity, memory constraints, and stream processing.

Production-readiness: Transforming your solution into clean, modular, maintainable, and testable code.

System-level extensions: Discussing concurrency handling, distributed computation, or caching strategies.

4. Behavioral Round Focus – “Googleyness”

The core of Google’s behavioral interview is assessing Googleyness — a term representing the qualities and values Google values most in employees. It’s conceptually similar to Amazon’s Leadership Principles. Interviewers evaluate across several dimensions: teamwork, leadership, user-centered thinking, creativity in problem-solving, and communication effectiveness. When preparing, it’s best to use the STAR framework (Situation, Task, Action, Result) to structure your stories. Base them on real experiences, and enhance with data or measurable impact where possible. A strong story should not only showcase outcomes but also demonstrate how you influenced others, drove progress, and learned from mistakes. If you’ve already prepared Amazon’s BQ stories, most can be reused with slight adjustments — just align your language with Google’s core values and culture.

5. Coding Topics and Common Question Types

Although Google’s problem set covers a wide range of topics, it heavily focuses on data structures and algorithmic fundamentals. The most frequent categories include:

Arrays & Strings: Sliding window, two pointers, sorting, and binary search (e.g., Longest Substring Without Repeating Characters, Merge Intervals).

Trees & Graphs: DFS, BFS, topological sort, union-find, and shortest path algorithms (e.g., Course Schedule, Word Ladder, Number of Islands).

Dynamic Programming: Subsequence problems, knapsack variants, and optimal pathfinding (e.g., Edit Distance, Coin Change, Longest Increasing Subsequence).

Heaps & Priority Queues: Top-K, streaming data, and scheduling problems (e.g., Kth Largest Element, Merge K Sorted Lists).

Backtracking & Search: Combinations, permutations, subsets, Sudoku, etc. (e.g., Permutations, Combination Sum, Sudoku Solver).

Classic Implementations: Custom data structures and optimization patterns such as Trie, bit manipulation, or LRU Cache implementation.

Google’s internship programs kicked off in 1999, not long after the company’s founding. An intriguing fact is that Craig Silverstein, Google’s first intern, eventually became its first employee and Director of Technology. Google internships provide driven students and young professionals with invaluable experience and the opportunity to contribute to the company’s pioneering projects.